Figure 2.
Effects of Se and Cd treatments on antioxidant capacity of tobacco. (A) nitroblue tetrazolium (NBT) staining of tobacco seedlings under different Se (Ⅳ) and Cd (Ⅱ) concentration supply conditions; (B) the content of MDA of tobacco seedlings under different Se (Ⅳ) and Cd (Ⅱ) concentration supply conditions; (C) the SPAD of the third young leaf of tobacco seedlings under different Se (Ⅳ) and Cd (Ⅱ) concentration supply conditions; 14-days-old seedlings (wild-type, Yunyan 87) were grown in pot with sand under different Se (0, 10, 50 μM) and Cd (0, 20, 50 μM) concentrations for 21 days. Se0: no Se; Se10: Se, 10 μM; Se50: Se, 50 μM; Cd0: no Cd; Cd20: Cd, 20 μM; Cd50: Cd, 50 μM. Shown are mean ± SD from five biological replicates. Different letters indicate significant differences (p < 0.05).